package com.lxk.concurrency.example.commonUnsafe;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;

import com.lxk.concurrency.annoations.NotThreadSafe;

@NotThreadSafe
public class DateFormatExample1 {

	private static SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");

	// 请求总数
	public static int clientTotal = 5000;

	// 同时并发执行的线程数
	public static int threadTotal = 200;

	public static void main(String[] args) throws Exception {
		ExecutorService executorService = Executors.newCachedThreadPool();
		final Semaphore semaphore = new Semaphore(threadTotal);

		final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);

		for (int i = 0; i < clientTotal; i++) {

			executorService.execute(() -> {
				try {

					semaphore.acquire();
					update();
					semaphore.release();

				} catch (Exception e) {
					System.out.println(e);
				}
				countDownLatch.countDown();
			});
		}
		countDownLatch.await();
		executorService.shutdown();

	}

	private static void update() {
		try {
			simpleDateFormat.parse("20180208");
		} catch (ParseException e) {
			e.printStackTrace();
		}
	}
}
